At least that is what the fingerprint machine kept saying to the lady trying to take my fingerprints today for our USCIS approval. :(
3 of my 10 fingers are apparently too smooth. I blame it on the endless diaper changes which result in endless hand-washing. She kept trying to get a "passing" fingerprint on those fingers but couldn't, so now they send them to the FBI anyway and see if they are good enough to clear. If not, they will send me a new appointment, and I will have to go back and try again.